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From sebb <seb...@gmail.com>
Subject Re: [math] StatUtils handling of zero length arrays - MATH-373
Date Thu, 10 Jun 2010 09:49:13 GMT
On 10/06/2010, Ted Dunning <ted.dunning@gmail.com> wrote:
> I would count this as a bug fix rather than a compatibility break.  (my vote
>  is non-binding, of course)
>

I agree that the current behaviour is wrong.

Unfortunately, the current behaviour is documented in the Javadoc, so
it would be a compatibility break.

>  On Wed, Jun 9, 2010 at 7:08 PM, Bill Barker <billwbarker@verizon.net> wrote:
>
>  > Currently StatUtils.sum(double [])  (as well as most other statistics that
>  > operate on arrays) returns NaN on a zero length array.  As pointed out in
>  > the Jira issue, this is not the conventional treatment of a summation over
>  > the empty set (which would return zero) in the mathematical world.  I would
>  > definitely want to change this in 3.0.  But I'm on the fence for how much of
>  > an incompatible change this would be for 2.2.
>  >
>  > The change is simple, and I'm volunteering to do the work.  I just wanted
>  > to ping the list for opinions on how much breakage we can allow in 2.2.
>  >
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